General · EdgepediaOctober 21, 20263 min read

Tyung

The Tyung (Russian: Тюнг; Yakut: Түҥ, Tüŋ) is a river in the Sakha Republic (Yakutia), Russia, and a left tributary of the Vilyuy in the Lena basin. It is 1,092 km long and drains a basin of 49,800 km², making it one of the nine Lena tributaries longer than 1,000 km.¹^•²^•³

Key fact	Detail
Length / basin	1,092 km; basin area 49,800 km²¹
Mouth	Joins the Vilyuy 332 km from its mouth, 4 km above the town of Vilyuysk; mouth elevation 88 m¹
Discharge	Mean annual discharge 180 m³/s²
Ice regime	Freezes in October; opens in the second half of May to early June²
Navigation	Navigable for 273 km from the mouth, from the village of Kyubyainde; listed in the Russian register of inland waterways¹

Course

The Tyung begins in the northeastern part of the Central Siberian Plateau at an elevation of about 460 m. The State Water Register of Russia records its source as Lake Khagdan.¹ It first flows eastward through mountainous country, and after descending to the Central Yakutian Lowland it turns southeast, meandering strongly across flat, partly swampy terrain underlain by permafrost.

At the mouth the river is about 150 m wide and up to 2 m deep, with a flow speed of about 0.6 m/s.⁴

Tributaries and hydrology

The Arga-Tyung, also known as Zapadnyy Tyung, joins 849 km from the mouth and drains 3,220 km².⁵^•⁶ The State Water Register lists more than a hundred named inflows, including the Salakut (16 km long, basin 1,120 km²), which enters 508 km from the mouth.¹^•⁷

Flow regime. Feeding is by snow and rain.² The mean annual discharge is 180 m³/s.² The river freezes in October and stays icebound until the second half of May or early June, a regime typical of the Lena basin, where long, stable ice cover and permafrost shape the annual cycle.²^•⁸ A gauging station operates at Ugulyats on the Tyung as part of the Lena basin observation network.³

Where the Tyung meets the Vilyuy 8 km upstream of Vilyuysk, it noticeably influences the flow structure of the larger river; during the open-channel period its runoff makes up 10–40% of the downstream flow at that point.⁹

Human use

The Tyung is listed in the Russian register of inland waterways for the 273 km stretch from the village of Kyubyainde to the mouth at the Vilyuy.¹ Fish recorded in the river include lenok, muksun, nelma, omul, sturgeon, grayling, whitefish species, pike, and ide, among others.¹⁰

Scientific importance

The Tyung valley is a reference locality for two very different records. Fifteen outcrops (T1 to T15) of the Timerdyakh Formation are cut by the river in the Vilui Basin; palynological and megafossil samples from these outcrops, of latest Campanian to earliest Maastrichtian age, have yielded some of the earliest records of several flowering-plant lineages, including the earliest record of the aroid subfamily Lasioideae, the subfamily Aristolochioideae, the Iridaceae/Doryanthaceae clade, and a possible early member of the Hydatellaceae.¹¹ A Cenomanian–Coniacian locality on the middle Tyung (point 421, 64.63°N 119.90°E) has also produced Mesozoic insect fossils.¹²

The river also appears in Pleistocene chronologies: a mammoth sample from the Tyung River (laboratory code GIN-3232) dated to 23,100 ± 200 radiocarbon years BP at 67.35°N, 116.00°E is part of the radiocarbon record of mammoth distribution across northern Eurasia.¹³

References

Topic: Encyclopedia › Places and geography › Waters and hydrographic features › Rivers, streams, and drainage features › Rivers and streams of Asia › Siberian and Russian Far East rivers

Initially written Oct 21, 2026 · Edited: Oct 25, 2026

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